Metal-forming tool



Patented Feb. 17, 1925.

`UNITED STTES orties.

f. bl

HERBERT W. NEUNHERZ, OF COLUMBUS, OHIO, ifliSEG-'NOR TO THE HARVEY MANU- FACTURING COMPANY, OF COL'VBUS, OIJO, ill. CORPORATION OF OHIO.

METAL-EO'RMING TOOL.

Application filed November 27, 1933.

To LZ2 will-0m 'it may concern.'

Be it known that l, Hnnunn'r W. NEUN- I-LERZ, a citizen of the United States of America, residing at Columbus, in the county of Franklin and State of Ohio, have invented certain new and useful improvements in Metal-Forming Tools, of which the following is a specification.

My present invention relates generally to metal bending devices and more particularly to met-al bending` dies, my object being` the provision of a simple economical arrangement capable of use in punch presses and the like for bendingrods, strap and like material as for instance in offsetting", hook formation, eye formations as well as other formations of a like character, quickly, uniformly and effectively.

At the present time operations of this nature require forming members, certain at least of which, must rotate, and the forniation o-f the desired bends is thus obviously a more lengthy operation than the quick clean stroke of a punch press which is all that is required according to my improvements.

Moreover the ordinary devices or machines do not provide, or at least do not readily provide, for adjustment so as to change the character of the product, as for instance from a hook and eye. According' to my invention it will be seen that such an adjustment is readily provided for by simply varying the stroke of the movable though nonrotatable die.

In the accompanying drawing which illustrates my present invention and forms a part of this specification,

Figure 1 is a side view of a punch press equipped with my improvements,

Fig. 2 is a sectional side View, on an enlarged scale, showing my improvements,

Fig. 3 is a detail side view of the die,

F ig. 4 is a top plan view of the frame and anvil, p

Fig. 5 is a sectional side view .showinp` substantially theV parts oi" Fig. 2 with the die lowered in action,

Fig. 6 is a horizontal section taken substantially on line 6 6 of Fig. 2,

Fig. 7 is a plan vieviT of the work, and

Fig. 8 is a sectional side view showing` a slightly modified form of anvil.

Referring now to these ligures and particularly to Fig. l I have shown my im- Seral No. 677,282.

proveniente applied to a known type of punch press 10 wherein the die holdings; plunger 11A descends in a. straight line in operation and .is adapted to receive the upper closed end of the cylindrical die 12 proposed by my invention which is adapted to be locked within the pllmger 11 as for instance by a set screw 13 shown in Fig. Q.

lhe die 12, which in accordance with my invention operates by rectilinear movement alone and without rotation, has a hollow body entirely open at its lower end and longitudinally .slottedfrom said lower end for a considerable portion of its length, tie body havingl an approximately straight edge 14: at one side of its slot and a helically curved edge 15 at the other side of its slot. Both of these edges present dat snrfaces of the fulll thickness of the wall of the die, the bore 1G of the latter of which may vary in size and is in use adapted to the size of the cylindrical anvil 17 upstanding from the press trame 18 through an opening,` 19 through a. material support or guide 20. y

The materiali support or guide 2l) may have an upstanding guide stud 21 at one side of its openingY 19 and is preferably provided with a limiting stud 22 at the opposite side of its said opening in order to thus readily gauge the length of that portion of the material such for instance as rod 23, which should be extended across the anvil 17.

ln operation the die descends and, without rotation, engages those portions of the rod 23 at opposite sides of the anvil 17 onto which the die telescopes.V The straight edge 111 of the die presses the inner portion of the rod against the guide stud 21 as shown in Fig. 6 while the helically curved edge 15 of the die engages the rod adjacent to its free end and gradually bends the same upon the upper surface of the anvil and in a lateral direction with respect to the movement of the die itself, around a central opening which may be either a centering pin 24 carried by the die and adapted to descend into a centering pin receiving bore 25 of the anvil 17 f a centering pin Q6 in the nature of a stu rising axially from the anvil 17a as shown in Fig. 8 and of which stud Q6 is an integral part.

It is obvious that in this operation the degree of bending of the free end portion of the rod 23 depends upon the extent to which the die' is lowered it being thus apparent that it is possible to either offset the rod as indicated by the dotted lines A in Fig. 7, bend its .tree end to various angular positions indicated by the dotted lines B, C and D, form a hook as indicated by the dotted lines E, or form a complete oye as shown in full lines at 2T, the latter lorm'ation being that resulting from a full downward stroke ot' the die.

Accordingto the construction shown in Figs. 2, 3 and 5, the centering' pin 2Liis formed upon the lower portion of and oepends from a plunger 28 which slidably interlits the bore lo et the die and is normally held in its lowermost position, with its limiting'shoulder 2) in engagement with an internal shoulder 30 ot the die, by a spring 3l which 'ii-hns permits the plunger with" its centering pin to yield upwardly within the die when the lower end oi the centering pin 2i, which precedes the lower end of the die itself in the downward move# nient of the latter, reachef,l the base of the bore 25 of the anvil;

It is "furthermore obvious that by the use of the die-carried centering pin lthe work when completed may be shifted laterally in a single movement 'from the anvil when the die is raised. Vlhile the construction in Fig. S, wherein the centering pin is integral with and uastands from the anvil itself, requires that the work, it either an eye or a formation closely approximating an eye, be raised vertically oli'l of the stud 2G before it can be freed from the anvil for the introduction of another section o1 wire or strap,

rlhus my invention provides for a bending'` operation in a single rectilinear movement oi the die without rotation of the latter so that uniform results are assured and speed and ecoi'iomy promoted. My invention also provides for bending in various degrees by simply varying the stroke ot" the plunger its-eli.

claim:

l. fr metal bendingdevice including an :invii and a die adapted to telescope the anvil, and a centeringpin carriediby the die around which the metal is bent on the anvil, said Cie having ahelically ourv d longitudinal edge avoiding the necessity oi' rotation in use and said anvil' having a bore reneiving the said centering" pin.

2i i metal bending device including an anvil having a bore, a centering pin around which the metal to enter said bore, and a hollow bending die achiptec` to telescope the anvil, said die being lengthwise slotted and having a straight edge at one side'ofV its slot and a curved edge at the opposite side' of the slot and ,aid centering pin being movably sup'- ported in the hollow ofv the'die:

2E. A metal bending device including an anvil, a centering pin around# which the metal is bent on the anvil, a hollowV die adapted to teiescope the anvil and having a lengthwise helically curved edge adapting the same for operation:without rotation and a centering pin coacting with the anvil and resiliently suiliiported in the hollow of the die.

ln testimony wbereo'iI have atiixed my signature.

HERBERT lV. NEUNHERZ.

is bent on the anvil adapted 

